Drift fitment tools
One tool so far, and it is the one that decides whether money changes hands: does the wheel in the ad clear the guard on your car. Everything here runs in the browser, costs nothing, and shows its working rather than emitting a number from nowhere. More will be added as they earn their place.
Free tool
Wheel offset calculator
Pick your chassis, type the diameter, width and ET off the listing, and read a plain-language verdict before the millimetres: tucks, flush, needs a roll, needs a pull or needs flares. Draws the wheel and tyre to scale against the guard lip, reports poke and backspacing to the rim flange rather than the bead seat, and checks the VSB14 track and overall diameter limits that apply in Australia.
Open the calculatorReading rather than calculating
A tool answers one wheel at a time. If you want the whole picture first, the S-chassis wheel fitment guide explains what PCD, diameter, width and offset each do, and the fitment chart publishes the offset bands the calculator is calibrated against. If there is angle hardware in the build, read the angle kit wheel clearance guide as well, because full lock decides the front long before the guard lip does.